Explosive-cap protection.



C. H. ALLISON. EXPLOSIVE GAP PROTECTION. APPLIUATION FILED Min 28, 1913;

Patented Apr. 28, 1914 nlilvllrll .Zhuenfor: wlziy' fi/mrlszs' H. 4/0500.

/waf may ifnot impossible to, shoot wells 'in' which there isa considerable -stand of water, for. the reason that the greatflwater pressure at .50' Theiparticulars of myinvention will ap- CHARLES H. ALLISON, OF GLENDALE, CALIFORNIA.-

f To all wilom it may canoe-m 'IJXPLosIvec'nr PROTECTION.

- Be it known that I, CHARLES H. ALLISON, i a citizen of the United States,-residing at Glendale, in' the county of Los Angeles', State of California, have invented new and use- I v dull Improvements in Explosive-Cap Protections, of which the followingis a specifica-.

' tion.

This invention relates particularly. to means for protecting explosive caps when subjected to greatwater pressure or when subjected to any other condition; which might injure the cap to prevent its detona- Heretofore .it has been extremely diiiicult,

I the bottom of such a well is suflicient to entirely destroy thedetonatin-g powe'rsof an ordinary cap. .111 fact;-'if an ordinary elece 'tri'e cap is simply exp0sed'to moist-ure its power of detonation is thereby very liable to be lost.

My' invention consists in certain meanswhereby-I aIn-jenabled'to lower a cap or caps into water of great depth and have unfailmg explosionfwhen-the. electric current 1s properlysupplied. 'In' fact, I, havejbee'n enabled-with my invention toexplode caps at aisubmergence of from 4000to 5000 ifeet.

Broadly oonsidered,' my invention com sists in an envelop or "covering around the that the material of the, envelop does. not

mrialwhich does not requlre water or other; liquidto-render it lfiStlG: I- preierably'em' ploya heavy gra e of'asphalQ' known as fD-Ig'rade, this being a material which s contain sufficient water to injure the caps; and 'Ithere'fore make my envelop ofa mateordinarilyfhard and solid, but which is of.

sufficient plasticity warmed slightly.

pear more fullyin the following specifica- "tion, and I have, shown my preferred-forms h in theaccompanying drawings, in which:

Figure 1 is; an 'e1evati on of a bundle of caps prepared =aceording to nay. invention.

to be. workable when.

Specification of Letters Patent- Patented Apr. 28, 1914. Application filed J'une28, 1913. Serial No. 776,450.

Fig. :2 is a longitudinal section taken as in dicated by line 22 of Fig. 1. Fig. 3 is a horizontal cross section of the sameflFig.

gt is an elevation illustrating a modified form of arrangement. F 1g. 5 1s a view showing the useof a form shown in Fig. 4;.

.In the drawings, the'numeral 10 may designate "any ordinary standard cap, of which I I may use any sultable number in one bunutilize more than four. The wires-l1 lead-r ingj out from the caps are electrically con-1 nected to wires 12 through which current. is supplied to detonate the caps. Wires 12 are preferably'rubber covered. so. as to be en-' tirely water-proof, and I may lead both the .dle. I have shownin the drawings a bundle of four caps; for certain purposes I wires 12 put fromoneend (if thecapbundle orI niay'lead one from one end and the other from the other. end,.as 'is illustrated in Fig. 4. "After the wiring connections have been made a suitable amount of plastic asdle of. caps; the asphalt being carefully phalt isworked intoa mass around the bunworked in between theca'ps. When finished anegg-shaped or ball-shaped envelop 1 3 is,

formed; the asphalt also being .worked carefully about the connecting wires .so' as-to' avoid all possibility of entry ofliquid where the wires enter the ball. The wholeis then taped, as. at 14:, with a: taping. of rubber,

which is drawn outt'hin and tight so as to form a tightly fitting'water-preof binder-for" theenvelopu Thistape is wound around the wireswhere-they enter the'envelop'; andthe .resultis an envelop which isperfectlywater proofand which is bound. in by the rubber..- tape so that it i cannot be physically destroyed the, waterpressure or by striking any 0 ject, orby abrasion. Y

In using in *ixnproved cap protection,- I I prepare'the caps either as shown in Fig; 1

winesmay be-led to the surface, or one wire .or -Fig. 4; Where it is desired only 'touse #one bundle of traps, then .the' 'wires12 are 'fled'fout' as shown in Fig. l; and either both may 'be connected-with" the water in which the caps are immersed,- In case I-wish; to use a series. of cap bundles, I then prepare eachbundle' as shown' in-Fig.. 4,= with the wires 12 leading out .from each end .of each leading to the surface. It will beund erstood that in the usual practice of shooting 11 wells, the. oapbundles' are placed within cap bundle, the (and wires being the ones sticks of. gelatin,-'and each. bundle willper p lflii iltb detonate two or th egf gelatin. ,7

My. c'ap, protection has, 'provenlvery suc- 7 cessfuliinactual use 0113/. l'argejscale. [As- ,hereinbeforei s'tated, I have beenablep'toi cause accurate'fdetonation "of from; 40,00 to 5000 '=feet of water, The materialsgwhich use are 1' capable ofwithstandinglan 'ex tre nely hea'vy compression, the asphalt-She in ,practically non-compressible, ;.and' the ru berztapepreventing disintegrationiofthe v asphalt. Butinspite ofthe' great compresr" .invention*, -I claim: V 1 v y T J1,- An explosive cap" protection, compris y 1 $912131 capable of being rendered plastic by heat and of relatively. low "disruptive;

'sion strength of myproteiztion it has a rela-" tively low-disruptive strength andthis isa j 115' [the -explosive iefiiciency of the caps; 1

necessaryvreqnisite in order-not tofda nppfi 1 1g, an envelop 'ofsolid Water-proof ma- '1 strengthpand ,a tapinglof Water-proofbinder 7 around th'efsaid envelop.

rubbe r tape around the envelop,

' 1 "about the, cap.

7 substantially uniform thicknessover the cap. 8, "An explosive cap protection, compris- ,ar0'und the envelop. 4. An explosive cap protection, compris-' cap. into a solid mass.

explosive cap protection, .comprising'an' envelop as asphalt, and a binding of 3; An explosive cap protection, comprising asolidenvelop of asphalt hard at normal 3O temperature; and a'binding'of rubber tape ing an -envelop of water-proof}.material Y kneaded about the cap in a solid mass. j

5,Anexp1osive cap protection, compris- ,7. An explosive. cap protection, compri sing an envelop, of Water-proof n'iaterial' kneaded'about the cap into a solid massofjing an: envelop of- Water-proof material kneaded about the-cap in a solid mass, and abinding tape'wound around the mass.

9. An explosive cap protection, compristective sheath.

' Witnesses kneaded about the cap into a solid mass of substantially uniform thickness over. the 1 a binding tape Woundiaround the can, and

. 10. 'AILeXplosive cap providedwith a pro- 'ect-ive sheath of 'asphalt um kneaded there- 'm at a "temperature ust' suflicient to permit the a'sphaltum to be plastic, and forminga substantially Y non coinpressiblecovering for I the explos ve cap; a

'1-1-. An explosive provided vvith a pro- .t ective covering of a material kneaded therein a lightly plastic condition and 25 ing a substantially non-compressible protectiVe sheath for said explosivec'a'p.

12. An' explosive-cap provided with, tective covering ofga material kneaded 'on the .ca in a slightly plastic condition and. form- 7 0 ing a substantially non-compressible protec- I tive sheath ofsubstantially uniform thi ckness on said explo'sivecap.

1'3.'The :process of protecting explosive caps subjected to high'h'yd'rostatie pressures, 75. 5

consisting of kneading a mass of material in a plasticconditionbn; the cap and permitting the material'to cool to form a hard pro-- 'lfhg'lhe process 0 caps subjected to high hydrostatic pressures, I .'consi'st'ing of kneading afmass of material v in a plastic conditionpn the cap, in a body of substantially-uniform thickness around ,the cap, and of allowingthe material to coolt'o form a 'hardprotective sheath. I

15, Ihe process of protecting explosive caps subjectedto high hydrostatic pressures consistingiof kneading asphaltum on' the ing. the material to harden.

f 16. The process of protecting. explosive caps. consisting in kneading a" massof as- "pha1tum on the-capto "form a covering ofsubstantially uniform thickness and 'permitting-the kneaded asphaltum to harden before-use. In Witness that I claim the foregoing I have" hereunto subscribed my name this 19th i JAMES T; BAR ELEW,

ing an envelop of Water-proof material j Copies of thisp atent may be obtained fort five eentsieach, by addressingthe'ftcummissioner of flatents,

" "Washington, I). 10."

; ELivoonHBAn rLnw,

a pro-- f .pr,otecting explosive 8,0

It is hereby certified that in Letters Patent N 0. 1,094,692, granted April 28, 1914,

upon the application of Charles H. Allison, of Glendale, California, for an improvement in Explosive-Cap Protections, an error appears in the printed specification requiring correction as follows: Page 2, line 26, claim 2, for the word as read of; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 6th day of June, A. D., 1916.

[SEAL] J. T. NEXVTON,

Acting Commissioner of Patents.

It is hereby certified that in Letters Patent N 0. 1,094,692, granted April 28, 1914,

upon the application of Charles H. Allison, of Glendale, California, for an improve ment in Explosive-Cap Protections, an error appears in the printed specification requiring correction as follows: Page 2, line 26, claim 2, for the Worc as read of;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 6th day of June, A. D., 1916.

[SEAL] J. T. NEWTON,

Acting Commissioner of Patents. 

